SEPARATE - Separation 90(I)4. S/ALQ&A/P.1 A mixture...

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Separation 90(I)4. A mixture contains equal amounts of X , Y and Z . OH NH 2 CH 3 Br X Y Z b.p. 182 ° C b.p. 184 ° C b.p. 184 ° C (a) Outline a chemical method to separate X , Y and Z from each other. ( 4 marks )\ 91(I)5. CH 3 NH 2 CH 3 NO 2 X Y (a) The amine X , C 7 H 9 N , may be prepared from Y , C 7 H 7 NO 2 , by reaction with excess hot granulated tin and concentrated hydrochloric acid. (i) If, in this reaction, some Y remains unreacted , suggest a procedure to isolate pure X from the reaction mixture. (ii) If 6 g of X is obtained from 10 g of Y , what is the percentage yield of the reaction ? ( Relative atomic masses : H , 1.0; C, 12.0; N, 14.0; O, 16.0 ) ( 6 marks ) 92(I)5.(a) Ethanoylation ( acetylation ) of phenylamine ( C 6 H 5 NH 2 ) may be carried out by refluxing for 1 hour with ethanoic anhydride ( acetic anhydride ) giving a product which is insoluble in cold water. ( Ethanoic anhydride hydrolyses in water to give ethanoic acid. The b.p. of phenylamine and ethanoic anhydride are 184 ° C and 140 ° C respectively; the m.p. and b.p. of the product are 114 ° C and 304 ° C respectively. ) (i) With the aid of a labeled diagram, show the laboratory apparatus required to carry out the above reaction. (ii) Give the structure of the product from the ethanoylation reaction. 92(I)5.(a)
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Separation (iii) Suggest one method for the isolation of the product from the reaction mixture. (iv) If 40 g of phenylamine is to be ethanoylated, calculate the mass of ethanoic anhydride required. ( Relative atomic masses : H , 1.0; C, 12.0; N, 14.0; O, 16.0 ) ( 7 marks ) 92(I)5.(b) An incomplete reaction of an amine with ethanoic anhydride gave a liquid mixture on cooling. Briefly outline a procedure, using a separating funnel and appropriate reagent(s), to isolate the ethanoylation product. ( 3 marks ) 94(I)3.(a) Consider the two compounds : CH 3 CH 2 CHCH 3 OH CH 3 CH 2 CH 2 NH 2 and C D (i) Explain how you would separate a mixture of C and D making use of the difference in their chemical properties and solubility. ( 3 marks )
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SEPARATE - Separation 90(I)4. S/ALQ&A/P.1 A mixture...

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